In a Dutch oven over medium-high heat, bring first 14 ingredients to a boil. Cook and stir until vegetables are tender, about 20 minutes. Remove from heat; cool slightly. Process in batches in a blender or food processor until smooth. Adjust consistency as desired with water or additional stock. Sprinkle with fresh cilantro. Serve hot, with lime wedges if desired., Freeze option: Before adding cilantro, freeze cooled soup in freezer containers. To use, partially thaw in refrigerator overnight. Heat through in a saucepan, stirring occasionally; add water if necessary. Sprinkle with cilantro. If desired, serve with lime wedges.